Adding one more example for lecture

Author: tilir

modules/imports/imported.cppm

@@ -0,0 +1,13 @@
+module;
+
+#include <cassert>
+
+export module imported; 
+
+import<string>;
+
+export std::string foo(int n) {
+  assert(n < 42 && "argument shall be less than 42");
+  return "Hello, world!";
+}
+

modules/imports/main.cc

@@ -0,0 +1,7 @@
+#include <iostream>
+
+import imported;
+
+int main() {
+  std::cout << "foo: " << foo(0) << std::endl;
+}

modules/imports/runme.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+CXX=clang++-18
+
+${CXX} --std=c++23 -fmodules --stdlib=libc++ --precompile imported.cppm -o imported.pcm
+${CXX} --std=c++23 -fmodules --stdlib=libc++ -fmodule-file=imported=imported.pcm imported.pcm main.cc